The engine for this swap is a badass 6.8L L99 mill from Mast Motorsports. It makes 570 hp at 6,200 rpm and 535 pounds of twist at 5,200 rpm. Inside, there's a Callies crank and rods along with Mahle pistons and Mast's Phaser VVT camshaft. Coincidentally, they ran the exact same Centerforce clutch and Quick Time bellhousing as Mary. Maybe we're on to something.